Finally have the engraving issues worked out. Now working on holding things down. I engrave first with an engraving bit, and then cut with a tiny endmill.
The tape is not firm enough for what I am doing–it moves. I am trying the wax. It holds up fine for the engraving, but then when I go to cut, it is moving during the last pass, destroying the charm. I am using the bit manufacturer’s recommended feed of 15" min and plunge of 5" per min. Is this heating up the metal so much that it is melting the wax, causing it to release, perhaps??